SO, I don't know how it did it, but my R4 kindly reset my PicrossDS save, which I've been playing for ages now

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Happens to me all the time on my M3 CF, Picross save seems to be picky. I managed to play a couple months worth with the jap version until my save got corrupted. Euro and US versions are even worst, i had to stop playing altogether because the save was always getting corrupted afetr a couple sessions. Only game i have save problem with.